66658803732 has 18 divisors (see below), whose sum is σ = 168498642858. Its totient is φ = 22219601232.

The previous prime is 66658803709. The next prime is 66658803733. The reversal of 66658803732 is 23730885666.

It can be written as a sum of positive squares in only one way, i.e., 36510037776 + 30148765956 = 191076^2 + 173634^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×66658803732² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66658803733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925816683 + ... + 925816754.

Almost surely, 2^66658803732 is an apocalyptic number.

It is an amenable number.

66658803732 is an abundant number, since it is smaller than the sum of its proper divisors (101839839126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66658803732 is a wasteful number, since it uses less digits than its factorization.

66658803732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851633447 (or 1851633442 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 66658803732 in words is "sixty-six billion, six hundred fifty-eight million, eight hundred three thousand, seven hundred thirty-two".